Cognomen Демил (Demille 
, Демил 
, Demils) , in the world, is quite a rare last name. The last name Демил is habitual in Saint Lucia, where it is quite a common surname, Canada, where it is a rare surname, and the United States. Not in comparison with a country's population, it is commonest in the United States, Canada, and Ethiopia. Very seldom, Демил is the forename as well as the last name.